1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 #include "priv.h" 24 25 #include <subdev/pci.h> 26 27 #define NV_PBUS_IFR_FMT_FIXED0_SIGNATURE_VALUE 0x4947564E /* "NVGI" */ 28 #define NV_ROM_DIRECTORY_IDENTIFIER 0x44524652 /* "RFRD" */ 29 30 struct priv { 31 struct nvkm_device *device; 32 u32 pci_rom_offset; 33 }; 34 35 static u32 36 nvbios_prom_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 37 { 38 struct priv *priv = data; 39 struct nvkm_device *device = priv->device; 40 u32 i; 41 42 /* Make sure we don't try to read past the end of data[] */ 43 if (offset + length > bios->size) 44 return 0; 45 46 /* Make sure the read falls within the 1MB PROM window */ 47 if (offset + priv->pci_rom_offset + length > 0x00100000) 48 return 0; 49 50 for (i = offset; i < offset + length; i += 4) 51 *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x300000 + priv->pci_rom_offset + i); 52 return length; 53 } 54 55 static void 56 nvbios_prom_fini(void *data) 57 { 58 struct priv *priv = data; 59 struct nvkm_device *device = priv->device; 60 61 nvkm_pci_rom_shadow(device->pci, true); 62 63 kfree(data); 64 } 65 66 static void * 67 nvbios_prom_init(struct nvkm_bios *bios, const char *name) 68 { 69 struct nvkm_device *device = bios->subdev.device; 70 struct priv *priv; 71 u32 fixed0; 72 73 /* There is no PROM on NV4x iGPUs */ 74 if (device->card_type == NV_40 && device->chipset >= 0x4c) 75 return ERR_PTR(-ENODEV); 76 77 priv = kzalloc_obj(*priv); 78 if (!priv) 79 return ERR_PTR(-ENOMEM); 80 81 /* Disable the PCI ROM shadow so that we can read PROM. */ 82 nvkm_pci_rom_shadow(device->pci, false); 83 84 /* 85 * Check for an IFR header. If present, parse it to find the actual PCI ROM header. 86 * 87 * The IFR header is documented in Documentation/gpu/nova/core/vbios.rst 88 */ 89 fixed0 = nvkm_rd32(device, 0x300000); 90 if (fixed0 == NV_PBUS_IFR_FMT_FIXED0_SIGNATURE_VALUE) { 91 u32 fixed1 = nvkm_rd32(device, 0x300004); 92 u8 version = (fixed1 >> 8) & 0xff; 93 u32 fixed2, data_size, offset, signature; 94 95 switch (version) { 96 case 1: 97 case 2: 98 data_size = (fixed1 >> 16) & 0x7fff; 99 priv->pci_rom_offset = nvkm_rd32(device, 0x300000 + data_size + 4); 100 break; 101 case 3: 102 fixed2 = nvkm_rd32(device, 0x300008); 103 data_size = fixed2 & 0x000fffff; 104 105 /* ROM directory offset */ 106 offset = nvkm_rd32(device, 0x300000 + data_size) + 4096; 107 108 signature = nvkm_rd32(device, 0x300000 + offset); 109 if (signature != NV_ROM_DIRECTORY_IDENTIFIER) { 110 nvkm_error(&bios->subdev, "could not find IFR ROM directory\n"); 111 goto fail; 112 } 113 114 priv->pci_rom_offset = nvkm_rd32(device, 0x300000 + offset + 8); 115 116 break; 117 default: 118 nvkm_error(&bios->subdev, "unsupported IFR header version %u\n", 119 version); 120 goto fail; 121 } 122 123 /* Double-check that the offset is valid */ 124 if (priv->pci_rom_offset >= 0x00100000) { 125 nvkm_error(&bios->subdev, 126 "PCI ROM offset of 0x%x is too large\n", priv->pci_rom_offset); 127 goto fail; 128 } 129 130 /* If there is an IFR header, there must also be a PCI ROM header. */ 131 signature = nvkm_rd32(device, 0x300000 + priv->pci_rom_offset) & 0xffff; 132 if (signature != 0xaa55) { 133 nvkm_error(&bios->subdev, 134 "could not find PCI ROM signature at offset 0x%x\n", 135 priv->pci_rom_offset); 136 goto fail; 137 } 138 } 139 140 priv->device = device; 141 return priv; 142 143 fail: 144 nvkm_pci_rom_shadow(device->pci, true); 145 kfree(priv); 146 return ERR_PTR(-ENODEV); 147 } 148 149 const struct nvbios_source 150 nvbios_prom = { 151 .name = "PROM", 152 .init = nvbios_prom_init, 153 .fini = nvbios_prom_fini, 154 .read = nvbios_prom_read, 155 .rw = false, 156 }; 157